CTlawyer,
1. The owner of the wedding hall is renting his property explicitly to be used for an aveira.
2. If it can force a baker to bake a cake why can’t it force someone to perform a marriage? Both are providing services.
3. Ask Oregon Judge Vance Day about judges refusing to perform same-sex marriages.
4. POTUS appoints Federal judges. In particular, there are three justices on SCOTUS who are around the eighty year old mark so the next one might well be able to setthe legal tone in America for the next generation.